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+---
+layout: documentation
+title: Changes - 0.4.x to 0.5.x
+---
+# Changes in Vagrant 0.5.x
+
+## VirtualBox 3.2 Requirement
+
+Although this has been true since Vagrant 0.4.2, I want to make a brief
+note of it here in a more prominent release announcement. Vagrant now only
+supports VirtualBox 3.2.x. Supporting 3.1.x in addition to 3.2.x was introducing
+complicated branch logic in the internals of Vagrant, opening up many areas
+for bugs to easily slip through. Because of this, I've decided to focus on VirtualBox
+3.2.x. If you must use VirtualBox 3.1.x, please use an earlier version of Vagrant
+(0.4.1 works nicely).
+
+## NFS Shared Folders
+
+It is a well known fact that VirtualBox shared folder performance degrades
+rapidly as the number of files in the shared folders increases (or if you
+don't know this now, you'll find out in the future as your project grows).
+Having worked on many multi-thousand file web projects, my coworkers and I
+quickly found that VirtualBox shared folders were too slow, and we had to
+resort to using tools such as rsync or unison to sync the "/vagrant" folder
+to some other non-shared-folder directory. This manual syncing process went
+against everything Vagrant believes in: not getting in your way and making
+development easier.
+
+We found that an easy solution was to punt VirtualBox shared folders and
+use NFS (http://en.wikipedia.org/wiki/Network_File_System_(protocol)) instead.
+Therefore, Vagrant 0.5 comes with built-in support for setting up and mounting
+NFS shared folders. If you're finding that your shared folders are becoming
+much slower than your native file system, I recommend you switch to using NFS.
+
+More details, including benchmarks, can be found at the [NFS documentation page](/docs/nfs.html).
+
+## SIGINT (Ctrl-C) Finally Works
+
+Thanks to some heavy internal refactoring and all out change, SIGINT (Ctrl-C)
+finally works during `vagrant` commands! During Vagrant 0.1 to 0.2, Vagrant
+used to leave VirtualBox in a broken state if you did Ctrl-C. And for 0.3 to
+0.4, it used to exit, but you were forced to manually clean up after Vagrant.
+And if you did a SIGINT before Vagrant could persist the VM UUID, then
+`vagrant destroy` didn't even work! UGH!
+
+But now, SIGINT anytime you want, and Vagrant will properly clean up after
+itself. Yes, you can even send an INT signal during an import or export,
+and everything will work out.
+
+## Huge Internal Changes
+
+Most of the work from 0.4.x to 0.5.x has been "under the hood" in preparation
+for future features. I expect these changes to bring about more stability in
+the long run to Vagrant, while possibly causing some very minor short term
+bugs, though my coworkers and I have been using Vagrant 0.5 in-house for a few
+weeks now without issue.